新闻动态
NEWS
Location:Chinese Academy of Sciences > NEWS  > News in field Carbon Nanotubes

Carbon nanotube porins make good water filters

Come: Chinese Academy of Sciences    Date: 2017-09-20 16:24:43


 Biological nanopores can rapidly transport selected ions and molecules through membranes. Aquaporins, for example, transport water at extremely high rates and can also desalinate. These proteins contain channels that are just 0.3 nm wide, which forces the water molecules to pass through in a single file.
 
A team of researchers led by Aleksandr Noy has now made the first artificial nanopore system that is not only better than aquaporin at filtering water but which can also filter out specific ions as well as biological ion channels can. The new membrane is made of carbon nanotubes (CNTs) that are 10 nm long and 0.8 nm wide embedded in a lipid bilayer. Again, the nanotubes are narrow enough to squeeze water molecules so that they pass through in 1D single file.
 
Testing out different CNT widths
The researchers, reporting their work in Science, obtained their results by testing out nanotubes of different widths to find out which were the best at filtering water. “We did this by embedding the tubes in lipid vesicle walls, applying osmotic pressure to the vesicles and then measuring how fast they shrunk as water flowed out of them through the ‘nanotube porins’,” explains team member and co-first author of the study Rama Tunuguntla.
 
The researchers found that nanotubes with a diameter of 0.8 nm are six times more efficient at filtering water than aquaporins. The flux through these tubes is also 10 times greater than those through 1.5 nm-sized ones.

< Previous Creating large-scale objects from the...Carbon nanotube micro-arrays poised t... Next >

Tel:+86-28-85241016,+86-28-85236765    Fax:+86-28-85215069,+86-28-85223978    E-mail:carbon@cioc.ac.cn,times@cioc.ac.cn,nano@cioc.ac.cn
QQ:    MSN:    Sky:wangyh789    Technical Support
Copyright © Chengdu Organic Chemicals Co. Ltd., Chinese Academy of Sciences 2003-2019. manage 蜀ICP备05020035号-3
任我赢机器人 重庆欢乐生肖彩 快3在线投注 海鸥娱乐系统 欢乐生肖 福建快三注册 福彩欢乐生肖走势图 欢乐生肖开奖结果查询 欢乐生肖玩法 欢乐生肖计划